Dredge Captain: Dredge operator, dredge runner Commands vessel equipped with machinery for excavating under water to facilitate building structures in harbors, estuaries, straits, sounds, rivers, lakes, bays, and oceans: Sets course of vessel, using navigational aids, for example charts, area plotting sheets, compass, and sextant, and orders worker at helm to steer ship toward excavation site. Determines geographical position of ship, using loran or azimuths of celestial bodies. Directs crew engaged in operating deck winches and lowering dredging equipment. Supervises crew engaged in dredging operations. Verifies depth of excavations to ensure that excavations are made according to requirements. Maintains ship’s log. Must be licensed by U.S. Coast Guard for steam, motor, or sail ship according to waters navigated and tonnage of ship.